feature: layout options for theme buttons

**Is your feature request related to a problem? Please describe.**

I want to have my theme buttons inside a menubutton but its awkward horizontally

**Describe the solution you'd like**

Would be nice to have option for theme buttons to be wrapped in alternative groupings for different use cases.

Maybe just exposing a new method without the inner horizontal group so you can wrap the buttons however you'd like (combobox, menubutton, vertical, etc).